code: def p_col_list_head(p):
      """col_list : col"""
      p[0] = [p[1]]
  
imports: import yaml
  from guild import _yacc
  from .None import Select, Scalar, Attr, Flag
  from .None import ParseError
  from .None import qlex
label_desc: Use image node_id 3 for calling a global function with example usage: p_col_list_head(p) without return types